Category Archives: Analytics Education

Problems Calculating Retention Rate

Jim answers questions from fellow Drillers
(More questions with answers here, Work Overview here, Index of concepts here)

Topic Overview

Hi again folks, Jim Novo here.

What is your customer retention rate? Well, that kinda depends on how you define the customer. Have you had an internal discussion, and more importantly, solidified agreement across divisions / functions on the definition of an (active?) customer? Please do.

For example, is someone who hasn’t interacted with your company in any way for over 5 years still a customer? You see, if you don’t specifically define a customer, then you can’t have discussions around topics like reactivation, retention, Lifetime Value (LTV) and so forth. Where to start? With segmentation. Create segments of similar customers, then try to decide which segments are still customers; this exercise will get you going down the right track. The Drillin’?


Q:  Seasonality has great effects on customers’ purchasing activities in the retailing industry, as you may easily understand.

A:  Yes…

Q:  Furthermore, what you call Latency has also great effects on their purchasing activities, (I mean, for example, the customer who purchased a coat in one winter season are not expected to purchase another until the next winter season and so forth.)

A:  Yes, but you are profiling customers, not products, right?  The customer who bought the coat may also buy a dress, shoes, pants in other seasons?  Your approach so far sounds a bit too product centric…

Q:  Here is the problem, how these issues of seasonality and Latency must be taken into consideration for calculating retention rate?

A:  Well, you can take it into account or not, depending on your objectives.  What is the objective of the analysis?  If the objective means you should take these issues into account, then you probably should segment the customer base to do so.

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Creating Effective Retention Campaigns

Jim answers questions from fellow Drillers
(More questions with answers here, Work Overview here, Index of concepts here)

Topic Overview

Hi again folks, Jim Novo here.

Have you ever offered a $100 off coupon to a new retail customer? I have. And guess what? There was no response, even though the average order size across all customers was $38!

So how is this kind of situation possible? Some products attract customers that are only interested in that product, and they are not going to buy again – period. Knowing this, the question for you: is this the kind of product you want to constantly feature / promote?

Guess that depends on the Drillin’, eh? Let’s get to it …


Creating Effective Retention Campaigns

Q:  Hi Jim,

Love your newsletters.  Do you have a tip jar I can use to donate to the cause?

A:  Hmmm…maybe I ought to start one…nah.  It all works out in the end!

Q:  Take a look at this chart I did of cumulative customer purchase Recency (actual numbers changed but the relationships are same): See below for explanation **

** Jim’s Note: How to read the chart:

“In the past 3 months, (“3” on horizontal axis), 30% of our customers have made a purchase (“30%” on vertical axis).  In the past 7 months, almost 40% of our customers have made a purchase.  Because the last category is “last purchase 36 months ago or longer”, the chart includes all customers – 100%.  

Since each customer can have only 1 “most Recent” purchase, each customer is on the chart only once.  Therefore, if 40% of customers have made a purchase in the past 7 months, 60% have not made a purchase.

Q:  What does this pattern (the % of total by group) tell one generally about the attrition in the business model?  It’s interesting, I’ve never looked at this kind of diagram before.  For our business (wine retailer with “club” option), I generally consider anyone with a transaction in the past 12 months to still be a customer.

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Analyzing Airline Customer Frequency Programs

Jim answers questions from fellow Drillers
(More questions with answers here, Work Overview here, Index of concepts here)

Topic Overview

Hi again folks, Jim Novo here.

Recency and the RFM model are both very powerful predictive models of customer behavior, But they’re not always the BEST models to use, because the nature of some business activities do not create the kinds of behavior these models are good at predicting. For example, any business – or segment of the business – that is likely to have a rhythmic repeating behavior (event occurs every week, or every month, or every summer, or every Christmas, etc.) will not benefit much from Recency analysis. But it is ideal for Latency analysis – when to expect an event, did it happen or not? Great example of both ideas in a single business would be the airline business – you have random flyers, and you have frequent flyers. Use Recency for random flyers, Latency for frequents. You dig? Great, let’s Drill it !


Q:  Can you please direct me to specific information (in your site) regarding analyzing data in the Airline frequent flyer programs?

A:  There isn’t anything specific to airline frequent flyer programs on the site, so I’ll create something though with this reply!

Q:  Are there any “success methods” that proved to be the right way to define one flyer over the other?

A:  Not sure what you mean by “define”… the triggers I have seen used in these kinds of programs usually have to do with changes in rate balanced against the value of the flyer.  So, you look for slow-downs in frequency, for example, people who used to fly 3 times a week that now fly only 1 time a week.  Their “fly rate” has dropped significantly and could be a flag for potential defection.

Q:  I’m familiar with the RFM method, and wonder how to implement an RFM score considering that you have a: 

* Flyer that is true loyal and doesn’t have any interest in flying to other parts of the globe (expensive long mileage ones) and yet,

* due to the method of RFM you will not find him at the “top customers”.

Well, I’m not sure RFM would be the right model for this kind of program.  You want to look more at a “rate of change” kind of model since there are many levels of activity and Recency isn’t always a controlling factor.

So for example, you could create “Frequency buckets” based on deciles – divide customers into Top 10%, second 10%, third 10%, 4th 10% down to the bottom 10% based on their annual Frequency.  Then track people based on how they are moving between the buckets.  Somebody who was in the Top 10% that falls down to the third 10%, then falls lower in their annual rate would be a likely defector.

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